Hunt’s comments come as he travels to the Persian Gulf to meet King Salman of Saudi Arabia, other members of the royal family and government ministers to “press for an end to the bloodshed in Yemen,” according to a government statement released ahead of the visit.

Hunt is the first British minister to visit Saudi Arabia since officials say Khashoggi was murdered inside the country's consulate in Istanbul on October 2. Saudi Arabia admits Khashoggi was killed in the building but denies its royal family was involved.

Turkey in recent weeks has issued a statement saying Khashoggi’s killers strangled the writer, who was a columnist for U.S. newspaper the Washington Post, and then dismembered his body “in line with advance plans.”

Istanbul also said it has audio recordings related to Khashoggi’s death, which it has sent to the U.K., Saudi Arabia and the U.S.

Riyadh has provided conflicting accounts to explain Khashoggi’s disappearance. Saudi authorities first said Khashoggi left the consulate alive before later admitting the writer's murder was premeditated.

“The international community remains united in horror and outrage at the brutal murder of Jamal Khashoggi one month ago,” Hunt said in a statement. “It is clearly unacceptable that the full circumstances behind his murder still remain unclear.

“We encourage the Saudi authorities to cooperate fully with the Turkish investigation into his death, so that we deliver justice for his family and the watching world,” Hunt added.

The Guardian reported on Sunday that the U.K. government has continued talks with Saudi Arabia since Khashoggi’s death to form closer economic, political and military relationships. The U.K. is entering the final stage of negotiations to sell to Riyadh Typhoon jets that are similar to the aircraft used in the Saudi-led bombing of Yemen, according to the Guardian.

Yemen has been in the midst of a civil war for the past three years, and Saudi Arabia has led a coalition of other Arab states to intervene in the war. But Saudi Arabia has faced scrutiny for civilian deaths in Yemen air strikes.

Hunt said the U.K. is determined to help end the conflict.

“The human cost of war in Yemen is incalculable: with millions displaced, famine and disease rife and years of bloodshed, the only solution is now a political decision to set aside arms and pursue peace,” Hunt said in his statement.

“We are witnessing a manmade humanitarian catastrophe on our watch: Now is the window to make a difference, and to get behind both the U.N. peace process and current U.K. efforts in the Security Council."